Being without a like or equal; unmatched; unequaled; unparalleled; single in kind or excellence; sole.

source: webster1913

adjective satellite

2

radically distinctive and without equal

Example:

he is alone in the field of microbiologythis theory is altogether alone in its penetration of the problemBach was unique in his handling of counterpointcraftsmen whose skill is unequaledunparalleled athletic abilitya breakdown of law unparalleled in our history

source: wordnet30

3

(followed by `to') applying exclusively to a given category or condition or locality